Molecular formula :
nature : a good pair of polymer solution or the ability of the solvent swelling. Generally, the choice of polymer - solvent must follow three principles, namely "polarity similar" principle (the polar solvent to the extent possible and will be dissolved or swelling of the polymer similar polarity), "solvent" principle (with different -- the two groups, the polarity of the closer, among the bonding is, the dissolution or sexual swelling the better it is) and "cohesive energy density or solubility parameter similar" principle (solvent cohesive energy density or solubility parameters to be possible and will be dissolved or swelling of the polymer when the cohesion energy density or proximity solubility parameter).
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